Harbison-Walker Refractories Company

NPDES permit MO0000710 · Minor NON-POTW · administratively continued, expires 2024-03-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2024-03-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
0of 12 forms filed late

Last period with anything received: 2026-06-30.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among MO permits in EPA's filings — check your permit).

Limits in force (37)

OutfallParameterStatisticLimitMonths
001Sulfate [as S]DAILY MX report only all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedDAILY MX <= 80 mg/L all year
001Oil and grease [soxhlet extr.] tot.DAILY MX <= 15 mg/L all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Nitrite + Nitrate total [as N]DAILY MX report only all year
001Aluminum, total recoverableDAILY MX report only all year
001Chromium, trivalent total recoverableDAILY MX report only all year
001ChlorideDAILY MX report only all year
001RainfallDAILY MX report only all year
001Chemical oxygen demand [COD]DAILY MX report only all year
001Storm water flowDAILY MX report only all year
001Chlorides + SulfatesDAILY MX report only all year
002Sulfate [as S]DAILY MX report only all year
002pHMINIMUM >= 6.5 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedDAILY MX report only all year
002Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
002Aluminum, total recoverableDAILY MX report only all year
002Chromium, trivalent total recoverableDAILY MX report only all year
002ChlorideDAILY MX report only all year
002RainfallDAILY MX report only all year
002Chemical oxygen demand [COD]DAILY MX report only all year
002Storm water flowDAILY MX report only all year
002Chlorides + SulfatesDAILY MX report only all year
003Sulfate [as S]DAILY MX report only all year
003pHMINIMUM >= 6.5 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspendedDAILY MX report only all year
003Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
003Aluminum, total recoverableDAILY MX report only all year
003RainfallDAILY MX report only all year
003Chemical oxygen demand [COD]DAILY MX report only all year
003Storm water flowDAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states